Abrading machine



Nov. 26, 1957 BQGART 2,814,171

ABRADING MACHINE Filed Aug. 2, 1955 R g l IN VEN TOR. GEORGE A BOGART (J HQJ" rate The invention relates in general to abrading machines and more particularly to abrading machines wherein waste abraded material is transmitted through a porous abrading member from one side portion thereof, where the abrading operation takes place, to another side portion thereof which communicates with waste collection passageway means.

An object of the invention is to provide a machine for abrading objects wherein material removed from the objects is exhausted to a waste collection area without entering and contaminating the atmosphere around the machine.

Another object of the invention is to provide an abrading machine which is easy to manufacture and economical and efificient in operation.

Another object of the invention is to provide an abrading machine having a porous abrading member which has a first and a second side portion wherein materials removed from articles being abraded on the first side portion of the porous abrading member pass through the abrading member to the second side portion thereof where they are collected in a waste material collection means.

Another object of the invention is to provide an abrading machine having an abrading member with a plurality of apertures extending therethrough with a means for producing a low pressure area on one side of the abrading member whereby material removed from articles being abraded on the other side of the abrading member pass through the apertures to the low pressure area.

Another object of the invention is to provide an abrading machine having a housing with an impeller rotatably mounted therein which impeller has a supporting faceplate connected thereto and adapted to move therewith which faceplate is provided with conduit means extending from one side thereof to the other whereby when a porous abrading material is attached to the faceplate to move therewith the material removed from an article being abraded will pass through the porous abrading material, through the conduit means and into the housing.

Another object of the invention is to provide a sanding machine wherein material removed from articles as a result of relative movement between a porous sanding member and the articles being sanded is forced through the porous sanding member to the other side thereof because of more material being constantly removed from the articles being sanded.

Another object of the invention is to provide an abrading machine having a means for constantly removing waste material from the abrasive particles which are located on the abrading member or disk whereby maximum efiiciency is obtained from the abrasive particles.

Another object of the invention is to provide a sanding machine wherein there is no build up of waste material on the surface of the sanding disk.

Another object of the invention is to provide a sanding machine with a means for constantly drawing or circulating air through a porous sanding'member whereby the 2,814,171 Patented Nov. 26, 1957 temperature of the sanding member is maintained at a minimum value and as a result the useful life of the sanding member is maintained at a maximum.

Another object of the invention is to provide a sanding machine having an impeller with blades extending therefrom which blades create a low pressure area within the housing when the impeller is actuated which serves to aid in drawing waste material and air through a porous sanding cloth into the housing and thereafter into a waste collection means.

Another object of the invention is to provide a sanding machine having a supporting grillwork member which has a first and a second side portion, and a porous sanding member connected to said first side portion of said grillwork and the second side portion of the grillwork communicating with waste collection passageway means whereby waste material will pass through the sanding member, through the grillwork and into the waste collection passageway means.

Another object of the invention is to provide a sanding machine with a supporting grillwork member which gives support to a sanding member and provides for the passage of waste material therethrough.

Figure 1 is an isometric view partially in section of the abrading machine of the invention;

Figure 2 is a side elevation view in section of the abrading machine taken along line 22 of Figure 1; and

Figure 3 is a fragmentary view of a portion of the porous abrading member which is utilized in the abrading machine of the invention.

The abrading machine is indicated generally by the reference numeral 10 and has been illustrated herein as a sanding machine and includes a generally cylindrically shaped impeller housing 11. The impeller housing 11 has a front face 14 and wall means 15 which wall means define an opening 16 to the impeller housing 11. The impeller housing 11 has a base portion 18 which is provided with a plurality of workbench mounting holes 19 which may be utilized for suitably attaching the impeller housing to a workbench. A waste collection passageway 22 having an opening 24 extends tangentially from the cylindrically shaped impeller housing 11 to a waste collection means 23. The waste collection means 23 may be a bag made of material which will pass air therethrough but which will hold waste material such as sawdust, paint, metal particles, etc. A bronze thrust type sleeve bearing 26 is press fitted into the impeller housing 11 to provide a suitable bearing surface for a drive shaft 27 which extends into the impeller housing. An impeller 30 is attached to the drive shaft 27 by means of a set screw 31 for rotation in accordance with the movement of the drive shaft. The drive shaft is provided with a pulley 32 which may be connected to any suitable drive means not shown in the accompanying drawings, for rotating the drive shaft and as a result also rotating the impeller 30. The impeller has a plurality of blades 35 extending generally radially therefrom. The impeller 30 also includes a faceplate or supporting grillwork member 36 connected thereto which faceplate has a first and a second side portion 37 and 38 respectively. The faceplate or supporting grillwork member 36 may also be referred to as a support member. The faceplate 36 has an outer periphery 43 and has conduit means 44 which include a plurality of openings 45 which openings extend from the first side portion 37 to the second side portion 38 of the faceplate 36. As best seen in Figure 2 the faceplate 36 is located within the opening 16 to the housing 11 with the outer periphery 43 thereof adapted to travel adjacent the wall means 15 of the impeller housing 11. The first side port on37 of the faceplate 36 is located slightly outwardly from the front, face of the impeller housing 11 or in other words as seen in Figure 2 the first side portion 36 lies 3 slightly to the left of a plane within which the front face 14 of the impeller housing lies.

A porous sanding or abrading member or abrasive member 50 shown in detail inrFigure 3 which comprises an abrasive material having a first and a second side portion 51 and 52 respectively. The abrasive material has a plurality of apertures 53 extending from the first side portion to the second side portion thereof. Attaching means 56 are provided for attaching the second side portion of the porous sanding member to the first side portion 37 of the faceplate 36. The attaching means which have been utilized for attaching the abrasive member to the faceplate comprises applying a small amount of cement to the periphery 54 .of the porous sanding member and then sticking it up against the faceplate. It should be readily recognized however that the porous sanding member might be attached to the faceplate in many ways such as by bolting, clamping, etc.

A tilting guide table 60 for supporting articles to be abraded is suitably attached to the impeller housing by bolts 61 and may be adapted for arcuate movement about the points of attachment to the housing. The .tilting guide table .60 is provided with a way 63. The way 63 is adapted to receive a suitable tool not shown which in turn is adapted to hold the piece of wood 62 at various angles in a'horizontal plane relative to the abrading member 50. These adaptations .provide that articles which are supported on the guide table 60 may be held against the porous abrading member at several desired positions. A calibrated gaging device not shown in the drawings may be provided for attachment to the housing to indicate the angle which the table 60 is located relative to the porous abrading member. In Figures 1 and 2 a piece of wood indicated by the dot-dash line 62, has been shown residing on the tilting guide table 60.

In operation the drive shaft 27 is caused to rotate by means of the pulley 32 being driven by a suitable drive means not shown in the drawings. Upon rotation of the drive shaft 27 the impeller 30 is caused to rotate within the impeller housing 11. The blades 35 which are attached to the impeller 30 cause a movement of air through the Waste collection passageway 22 and as a result create a low pressure area within the impeller housing 11. The low pressurev area within the housing causes air to be drawn through the apertures 53 within the porous abrading member 50 and on through the conduit means 44 which are located in the faceplate 36 and into the impeller housing 11 and hence thereafter into the waste collection means 23. During an abrading operation and utilizing the piece of wood 62 which is shown in Figure 2 to best illustrate this operation, while the impeller 30 is causing the porous abrading member to rotate, the piece of wood 62 is moved into engagement with the moving first side portion 51 of the abrading member 50. Because of this contact abraded material or sawdust removed from the block is passed through the apertures in the porous abrading member on through the openings 45 in the faceplate 36, and into the interior of the impeller housing. The low pressure area caused by the blades 35 serves in a large measure to draw these waste particles into the housing.

It has been found that the low pressure area within the hous ng which is created by the blades 35 is very beneficial but particles will work their way through the porous abrading member into the discharge passageway without the low pressure area. In operation without the blades, by holding the piece of wood 62 in contact with the abrasive member 50, the removed waste particles will start to pass through the apertures 53 in the porous abrading member. Waste particles which are removed subsequently thereto will tend to force the previous waste particles on into the impeller housing Where they would naturally drop by the force of gravity into the waste collection area 23. It should also be readily understood that a great number of methods may be utilized for producing the low pressure area within the impeller housing when the low pressure area is desired.

To more fully describe the porous abrading member of this invention it includes a plurality of interwoven rayon fibers 67 running at approximately degrees to each other which are subsequently provided with or coated with an abrasive material 66 such as aluminum oxide. The resulting porous sanding member therefore has a resulting appearance of screening such as that which is found in the screen door of the average home. The porous abrading member has been shown in Figure 1 with an upper portion thereof curled over. This is not because the abrading member is weak and will not support itself, because in reality it is relatively stiff and self-supporting, but because it provides a better method of illustrating both sides of the abrading member and the fact that the apertures extend clear through.

The unique design of the abrading machine which has been herein disclosed therefore insures that as soon as waste particles are removed from articles which are being abraded they will be transported from the first side portion of the porous abrading member through the apertures therein to the second side portion thereof and into a waste collection passageway means and on to a waste collection means without entering into and contaminating the also helps to maintain the abrasive at its peak efiiciency.

The reason for this is that as soon as waste particles are removed from articles which are being abraded, the waste particles are immediately removed from the abrading member. This prevents build up of waste material on the abrading member and always maintains the maximum abrading quality of the abrading member. Since the sanding member of the invention has abrasive material on both sides it may be reversed when one side becomes worn and the other side may be used thus giving a double life to the sanding member.

Although this invention has been described in its preferred form with a certain degree of particularity, it is understood that the present disclosure of the preferred form has been made only by way of example and that numerous changes in the details of construction of the combination and arrangement of parts may be resorted to Without departing from the spirit and the scope of the invention as hereinafter claimed.

What is claimed is:

1. An abrading machine for abrading an article including a housing having wall means defining an opening thereinto, waste collection means cooperating with said housing, bearing means secured by said housing, a drive shaft journalled by said bearing means, a backing plate, an impeller formed integrally with said backing plate, means connecting said backing plate and said impeller to said drive shaft to mount same in said opening of said housing for rotation therein. wall means defining a plurality of conduits extending through said backing plate, said impeller including a plurality of radially extending blades within said housing, an abrading member comprising a first plurality of generally parallel members extending in spaced apart relationship, a second plurality of generally parallel members extending in spaced apart relationship and crossing said first plurality of members and extending generally transverse to said first plurality of members and interwoven therewith, said first and second plurality of interwoven members forming a plurality of apertures through said abrading member, abrasive material secured to said interwoven members and covering both sides of said abrading member, means including said abrasive material for substantially fixedly securing said first and second plurality of members relative to each other, said conduits in said backing plate being relatively large as compared to the apertures in said abrading member, means securing said abrading member to said backing plate with a plurality of said apertures of said abrading member being in line with a single conduit of said backing plate, rotation of said drive shaft causing rotation of said impeller whereby a low pressure is created within said housing and particles removed from an article because of the action between the article and said abrading member are caused to be drawn through said apertures in said abrading member and said conduits of said backing plate and thence to said waste collection means.

2. An abrading machine including a housing having wall means defining an opening thereinto, a drive shaft journalled by bearing means, a backing plate located in said opening, an impeller, means connecting said backing plate and said impeller to said drive shaft to rotate same, wall means defining a plurality of conduits extending through said backing plate, said impeller including a plurality of blades, an open mesh abrading member comprising a first plurality of members extending in generally the same direction in spaced apart relationship, a second plurality of members extending in generally the same direction and in spaced apart relationship and crossing said first plurality of members and extending generally transverse to said first plurality of members, said first and second plurality of crossed members forming a plurality of apertures through said abrading member, abrasive material secured to said crossed members and covering both sides of said abrading member, means including said abrasive material for substantially fixedly securing said first and second plurality of members relative to each other, said conduits in said backing plate being relatively large as compared to the apertures in said abrading member, means for securing said abrading member to said backing plate with a plurality of said apertures of said abrading member being in line with each conduit of said backing plate, rotation of said drive shaft causing rotation of said impeller whereby a low pressure is created within said housing and particles removed from an article because of the action between the article and said abrading member are caused to be drawn through said apertures in said abrading member and said conduit of said backing plate and into said housing.

3. An abrading machine including a housing having wall means defining an opening thereinto, a backing plate mounted in said opening in said housing, wall means defining a plurality of conduits extending through said backing plate, means for moving said backing plate relative to a work piece, an open mesh abrading member comprising a first plurality of members extending in generally the same direction and in spaced apart relationship, a second plurality of members extending in generally the same direction and in spaced apart relationship and crossing said first plurality of members and extending generally transverse to said first plurality of members, said first and second plurality of crossed members forming a plurality of apertures through said abrading member, abrasive material secured to said crossed members and covering said abrading member, means including said abrasive material for substantially fixedly securing said first and second plurality of members relative to each other to prevent relative movement therebetween, said conduits in said backing plate being relatively large as compared to the apertures in said abrading member, means securing said abrading member to said backing plate with a plurality of said apertures of said abrading member being in line with each conduit of said backing plate, and means for creating a low pressure within said housing whereby particles removed from an article being abraded are caused to be \drawn into said housing.

References Cited in the file of this patent UNITED STATES PATENTS Re. 21,852 Anderson July 15, 1941 1,408,851 Weiss Mar. 7, 1922 2,010,330 Stanley Aug. 6, 1935 2,328,998 Radford Sept. 7, 1943 2,379,503 Teager July 3, 1945 FOREIGN PATENTS 90,107 Germany Jan. 7, 1897 522,307 Germany Mar. 19, 1931 648,551 France Dec. 11, 1928 

